1-20, Multiple Choice. Mark the letter of the best choice on your Grademaster fo

Question

1-20, Multiple Choice. Mark the letter of the best choice on your Grademaster form. Only one answer is possible for each question. (2 pts each) For questions 1&2, an expandable balloon is filled with helium gas at atmospheric pressure. Select the letter of the balloon diagram that corresponds to the final volume for the given change in conditions. (The volume of “B" is the Initial Volume A same as the initial volume.) The temperature is changed from 200°C to 100°C at constant pressure, with no leaking. 1. A) A (decrease) B) B (stays the same) C) C (ncrease) 2. The amount of helium in the balloon is increased under constant pressure and constant temperature. A) A (decrease) B) B (stays the same) C) C (increase) The temperature of a 0.325 L gas sample at 25°C and 0.150 atm is changed to 250°C. What is the final pressure of the system, at constant volume? 3. C) 0.0855 atm D) 0.570 atm A) 0.263 atmB) 1.5 atm Page 1 of 6

Explanation / Answer

1)

V/T is constant

so, decreasing temperature will decrease Volume

Answer: A

2)

Here V/n is constant

increasing n will increase V

Answer: C

3)

we have:

P1 = 0.150 atm

T1 = 25.0 oC

= (25.0+273) K

= 298 K

T2 = 250.0 oC

= (250.0+273) K

= 523 K

we have below equation to be used:

P1/T1 = P2/T2

0.150 atm / 298.0 K = P2 / 523.0 K

P2 = 0.263 atm

Answer: A

Feel free to comment below if you have any doubts or if this answer do not work. I will edit it if you let me know

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